Natural Gas Heating Value Calculator

Calculate gross and net heating value of natural gas from composition. Essential for gas sales contracts, flare calculations, and combustion engineering.

Inputs

Methane CH₄ (mol %)

Ethane C₂H₆ (mol %)

Propane C₃H₈ (mol %)

i-Butane (mol %)

n-Butane (mol %)

Nitrogen N₂ (mol %)

Results

Gross HHV

BTU/scf

Net LHV

BTU/scf

Gas Specific Gravity

(air=1)

Molecular Weight

lb/lb-mol

Equations

Heating value: HHV = Σ(y_i × HHV_i) where HHV_i is pure component gross heating value

Component HHVs (BTU/scf): CH₄=1012, C₂H₆=1769, C₃H₈=2516, i-C₄=3252, n-C₄=3262, N₂=0

LHV ≈ HHV - 50.3 × H₂O_formed_per_scf

Molecular weight: MW = Σ(y_i × MW_i), air MW = 28.97; SG = MW/28.97

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